I am mostly looking at Unreal Engine games, since that's the editor I'm focused on at the moment. I also want to do single player levels and missions, as opposed to multiplayer maps.
I thought about Skyrim, but it doesn't excite me very much. Map design isn't very important in it, and the story takes most of the focus for most of the missions. I can't think of many areas aside from towns that really stand out.
I would like to make some games using engines like UDK or CryEngine, but for now, that would be adding a bit too much on my plate. I've already got quite a bit going on.